QUESTION 21 Marc, a single taxpayer, earns $60,000 in taxable income and $5,000 in interest from an investment in city of Birmingham bonds. Using the US, tax rate schedule for year 2019, what is his effective tax rate (rounded)? (Rour your final answer to the nearest whole percent.) (Use tax rate schedule.) A. 11.75 percent B. 13.94 percent C 20.31 percent D. 10.48 percent